The My Community Widget allows you to show users who have recently interacted with your WordPress.com site. Here’s an example of what it looks like:

Once you add the widget to your sidebar from Appearance -> Widgets, you’ll see that the widget settings look like this:

Title – The title of your widget (i.e. “My Community”).

Show how many users? – Select whether you want a short or long list of users.

Include activity from… – You can choose from three types of activity a user can take to interact with your site. Choose from your Likers, Commenters, or Followers, or any combination of the three, to generate the list shown in this widget.